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Terahertz radiation source

A radiation source, Hertz wave technology, used in radiation sources, masers, discharge tubes, etc.

Inactive Publication Date: 2009-02-11
李德杰
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the cathode voltage is -10000 volts, in order for electrons to pass through the waveguide in half a cycle, the narrow side of the waveguide must be less than 30 microns, and the wide side of the waveguide is generally about 200 microns, even if absolutely smooth silver is used as the waveguide wall, Such a width-narrow-side ratio will also lead to a waveguide loss of up to 0.33dB / mm. Considering the processing finish, the loss will reach at least 0.5dB / mm. For a waveguide length of 5 cm, the loss will be at least 25dB, which is equivalent to the gain and basically no amplification.
As for the dielectric slow-wave traveling wave tube, problems such as processing and charge accumulation will become insurmountable obstacles

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0022]Embodiment 1: The output power of the microwave source is 1 watt, and the frequency is 30 GHz, which is input into the resonant cavity of the THz wave generator through the hollow metal waveguide. The cathode adopts an oxide hot cathode, and the potential of the focusing electrode is negative relative to the cathode. The microwave resonant cavity adopts a reentrant cavity structure and is made of oxygen-free copper. The electron beam drift cluster hole diameter is 0.4 mm, the nose cone spacing is 0.4 mm, and the drift tube length behind the nose cone is 3 mm. The film radiation antenna is made of titanium-gold composite film with a thickness of 300 nanometers. The dielectric layer in the thick film capacitor is polyimide with a thickness of 50 microns. A voltage of -1500 volts is applied to the cathode, the total current emitted by the cathode is 3 mA, and a voltage of -750 volts is applied to the antenna to obtain an average power of 300 milliwatts of THz wave radiati...

Embodiment 2

[0023] Embodiment 2: The power of the microwave source is 1 watt, the frequency is 30 GHz, and it is input into the resonant cavity of the THz wave generator through the coaxial line. The cathode adopts film-coated barium tungsten thermal cathode, and the potential of the focusing electrode is negative relative to the cathode. The microwave resonant cavity adopts a reentrant cavity structure and is made of oxygen-free copper. The electron beam drift cluster hole diameter is 0.4 mm, the nose cone spacing is 0.4 mm, and the drift tube length behind the nose cone is 4 mm. The film radiation antenna is made of titanium-gold composite film with a thickness of 300 nanometers. The dielectric layer in the thick film capacitor is polyimide with a thickness of 50 microns. A voltage of -1500 volts is applied to the cathode, the total current emitted by the cathode is 3 mA, and a voltage of -750 volts is applied to the antenna to obtain an average power of 300 milliwatts of THz wave rad...

Embodiment 3

[0024] Embodiment 3: The output power of the microwave source is 0.8 watts, and the frequency is 40 GHz, which is input into the resonant cavity of the THz wave generator through the hollow waveguide. The cathode adopts a micro-tip type field emission cold cathode, and the potential of the focusing electrode is negative relative to the cathode. The microwave resonant cavity adopts a reentrant cavity structure and is made of oxygen-free copper. The electron beam drift cluster hole diameter is 0.3 mm, the nose cone spacing is 0.3 mm, and the drift tube length behind the nose cone is 2.5 mm. The film radiation antenna is made of titanium-gold composite film with a thickness of 300 nanometers. The dielectric layer in the thick film capacitor is polyimide with a thickness of 40 microns. A voltage of -1500 volts is applied to the cathode, the total current emitted by the cathode is 2 mA, and a voltage of -750 volts is applied to the antenna to obtain an average power of THz wave r...

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Abstract

A Terahertz wave radiation source belongs to the technical field of Terahertz wave. The basic structure comprises a microwave source, a connecting wave guide and a Terahertz wave generator. The Terahertz wave generator works in a vacuum state in a tube, and mainly comprises a cathode for emitting electrons, a focusing electrode, a microwave input wave guide, a microwave cavity, an electron beam drifting and bunching pipe, an extraction electrode, a thick film capacitor, a thin film radiating antenna, an electron beam focusing magnet and a pole shoe. The invention has a simple structure, the output power and efficiency greatly exceeding that of the prior Terahertz wave generator, is suitable for large-scaled production, and has wide application prospect in the fields, such as material detection, human body imaging, component analysis, and the like.

Description

Technical field: [0001] The invention is a novel terahertz wave radiation source, belonging to the technical field of terahertz waves. Background technique: [0002] Terahertz wave (THz) generally refers to electromagnetic waves with a frequency ranging from 300 GHz (300 mega gigahertz) to 10 THz, which is a basically unused frequency band. The research and development of THz waves has progressed rapidly in recent years, and its potential applications are very extensive, including radar, communication, material detection, drug detection, human imaging, and a wide range of military applications. In terms of material detection and human imaging, it has some unique advantages compared with X-rays, such as basically no harm, the sensitivity to organic substances such as human tissue and drugs is quite different from X-rays, and completely different images can be obtained. Small size, light weight, low power consumption and other characteristics provide a very effective solution...

Claims

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Application Information

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IPC IPC(8): H01J25/00H01J23/00H01S1/00G21G4/00
Inventor 李德杰
Owner 李德杰
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